The official website for the Onihei anime has uploaded it´s first ad which contains the announcement that this anime will be an exclusive of Amazon Prime vdeo service.

Shigeyuki Miya (Blood Lad) is directing the anime and designing the charactrs at Studio M2.

My anime lisy describes the anime as follows:

“The blade arts of the “Devil” tasked with stiking down evils threatening a peaceful Edo! Heizou Hasegawa, upholding the role of chief officer protecting against crime and arson! In 1783, the heart of the Tenmei era, Hasegawa held the office of chief director of the department charged with sustaining safety in the region, suppressing the most vile of thieves and criminals, an individual largely feared, renowned as Devil Heizou...”